(CNN) - Fortune Magazine released its annual list of the top 100 companies to work for - topping the list this year, once again, is Google. The darling of silicon valley is followed by software developer SAS, the Boston Consulting Group, financial services firm Edward Jones, and Quicken Loans.

So just what makes these companies so special?
"The most important thing is how happy is the work force," said assistant managing editor of Fortune Magazine Leigh Gallagher.

"We're not necessarily measuring the square footage of the gym, or notching the number of, you know, fairs that they get to go to, or pilates classes they get. But it's how happy people are," said Gallagher.

For more of our interview with Fortune's Leigh Gallagher, check out the video above.

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